Formation of conical microstructures upon laser evaporation of solids |
| |
Authors: | SI Dolgaev SV Lavrishev AA Lyalin AV Simakin VV Voronov GA Shafeev |
| |
Institution: | (1) General Physics Institute of the Russian Academy of Sciences, 38, Vavilov street, 117942, Moscow, Russia, RU |
| |
Abstract: | The formation and development of the large-scale periodic structures on a single crystal Si surface are studied upon its evaporation
by pulsed radiation of a copper vapor laser (wavelength of 510.6 nm, pulse duration of 20 ns). The development of structures
occurs at a high number of laser shots (∼104) at laser fluence of 1–2 J/cm2 below optical breakdown in a wide pressure range of surrounding atmosphere from 1 to 105 Pa. The structures are cones with angles of 25, which grow towards the laser beam and protrude above the initial surface
for 20–30 μm. It is suggested that the spatial period of the structures (10–20 μm) is determined by the capillary waves period
on the molten surface. The X-ray diffractometry reveals that the modified area of the Si substrate has a polycrystalline structure
and consists of Si nanoparticles with a size of 40–70 nm, depending on the pressure of surrounding gas. Similar structures
are also observed on Ge and Ti.
Received: 12 February 2000 / Accepted: 28 March 2000 / Published online: 20 June 2001 |
| |
Keywords: | PACS: 42 62 -b 79 20 D 81 15 Fg |
本文献已被 SpringerLink 等数据库收录! |
|